Add BSD Zero Clause License

LICENSE

@@ -0,0 +1,12 @@
+BSD Zero Clause License
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE. 

README.md

@@ -29,6 +29,7 @@ A modern C++11 game engine using SDL2 and Vulkan.
    Optional configuration flags:
    - `--with-sdl2=PATH`: Use SDL2 from specified path
    - `--with-vulkan-sdk=PATH`: Use Vulkan SDK from specified path
+   - `--enable-testing`: Enable unit tests
 
 3. Build the project:
 ```bash
@@ -46,6 +47,7 @@ make
 - SDL2 for window management and input handling
 - Vulkan for high-performance graphics
 - Automatic dependency management
+- Comprehensive test coverage
 
 ## Development
 
@@ -54,4 +56,11 @@ The project structure:
   - `renderer/`: Vulkan rendering code
   - `game/`: Game logic code
 - `deps/`: Dependencies and build scripts
-- `m4/`: Autoconf macro files 
+- `m4/`: Autoconf macro files
+- `tests/`: Test files
+  - `unit/`: Unit tests
+
+## License
+
+This project is licensed under the BSD Zero Clause License - see the [LICENSE](LICENSE) file for details.
+This means you can do whatever you want with the code, no attribution required. 

configure.ac

@@ -2,6 +2,7 @@ dnl Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.69])
 AC_INIT([DOOM_PP], [0.1], [[email protected]])
+AC_COPYRIGHT([BSD Zero Clause License])
 
 # 确保源码目录存在
 AC_CONFIG_SRCDIR([src/main.cpp])